Relief mechanism



Oct. 25,1927, v 1,647,045

. F. HUMPHRIS RELIEF MECHNISM Filed Nov. a, 1926 f al@ w w a ad; W W/l /ff'd/ WJ,

Patented Oct. 25, 1927.

` UNrrEDV sjrxrissA FRANK HUMPHRIS, or PARKsToNE, ENGLAND,

RELIEF 'Mnci'i'ANisM Application filed' Novembers, 192e,Y serial No. 147,150, andii Geat Britain oetob'rei, 19'2'5.vk

This'in'v'ention consists of improvements in and. relating' to relief-mechanism for use in pressing, punching,V shearing, forging or like machines ,(hereinafter termed the machine) Whereit is desired to avoid breaking the machine when abnormal stresses occur, for example, if anyA hardung yieldingsubs'tance gets betweenA any of the cutting,v punching,- shearing, forming or like elements'used`l in the machine. y Y

Briefly, the invention consists in 'providing, for use with or in the machine a. separate and self contained relief-mechanism or ai relief-mechanism partly' or wholly incorporated in the body or frame of the machine, which relief-'mechanism is provided with a relief-table capable of retroceding and of returning: tothe initial position-from which it began to retrocede.

Oneobject of this invention is to provide a reliel?mechanism having suchl strength and durability that it will withstand the loads or pressures imposed upon it Without deteriorating `more rapidly; than the said machine in whichit'isplaeed'or incorporated and, to ensure this', large bearing'fareas are provided on the` bearing elements which take or sustain'the pressure. i

It'y willbe necessaryto provide numerous sizes lof relief-mechanism, some containing a greater and Vsome a lesser rnu'mb'ervof edgepressure-plates' or thein equivalents, but all embodying the chief features 'ofc'onstru'ctioii and essential elementsoic this invent-ion; The invention -will new be kdescribed .and trated as'appliedto a mechanicalpres's of known kind whereina ram-member Has rec-A tilinear",reciprocating movement in directions towards and away' from theQre'lief-"table =of the 'relieflmechanism Itis 'to be .understood howeifer, that the illustrationsl are given merely by way of example.l

Inthese drawings: Figure lis a part sectional view: of arelie'fem'echanis'maccordingto this yvinvention,

Figure 2fis apartial sectional .view of a vniodiied construction of relief-mechanism.'

Figure fisa partial sectional'view, on'a reduced'v scale, showing a; uid' yieldingdevice comprised in thein-vention.

. t through a lever t3.

further modied form yof relief-mechanism:

` Figure 'isa view'ofon'ev end oftheinecha# nisn shown lin Figure v1 or Figure'Q; and;r

Figure is a View of'the opposite: end thereof,4 i y f Figure 7 is an enlarged vie'wof an adjust?- ing-screw comprised in Figure i i Y Figure 8 is a cross-sec't'ional'view of" the relief-mechanism on the line 8- -8 Figure'l.

Figure 9 is a side View, and

Figure an end'view of an indicator'bar hereinafter referred t0."

Like'letters of reference refer to like parts throughoiit the drawings;

A relief table a'is'supported by or through bearer plates c, c and f and edge pressure plates d. and links g (Figure 1)fof the char;- acter' described in U. S, Patent N o. 1,473,478, of November 26,' 1923, or saidy reliefv table o mayl be supported by or' through bearer plates c and f, edge pressure plates`d,"linkslg and ,anti-friction members such as' rollerse (Figure 2) of vthe character described inv U. PatentNo. 1,622,144, of Mar-'ch 22, 1927. Resilient meansare provided yto act upon one end ofthe bearer plates In Figures 1 and 2 suchmeans is shownascomprising a compression spring g havingoneend bearingvr directlyV against one end ofthe bearer plateff and its'opposit'e endfbearinglagainst the inner end. oia ,screw L mounted in acasingu'L carried by one end of thel casing. y In Figure 3 said resilientv means is shown as comprising a pair of cooperatinfr'ramssand working in fluid containers'ormed as' a partof orattachedto one end of the casing j, the first-named rammember acting directly upon oneend of the bearer plate andaJ tension spring tf acting on the ram member In Figure 4 said'refsilient means is shown as comprising a tension springg* acting indirect-ly, through a vlever c' andlink o, upon one end of the bearerA plate `In this' embodiment ofthe l invention the spring g4 has one end con- `nected to one end of the lever cf and its opposite` end connected'to oneend of aV screw Ait extendingjthroug'hthe oppos'ite'end `of the casing. A nut h5 on the opposite end of the screw bears against the outer face of the casing and serves to adjust the tension of the spring g4. The spring g, (Figures l and 2), or the spring g4, (Figure 4), or the ram members and spring t associated therewith, (Figure 3), serve to limit the travel of the bearer plates f in one direction. An adjustable stop Z is slidably or rotatably mounted in the casing y' to engage the opposite end of the bearer plate f and thus limit the movement of said plate in the opposite direction.

According to the embodiment of the invention shown in Figure 1 a table supporting bearer-plate c is attached to, or is formed integral with the inner-face a of the relieftable a and a second or another so-called base-bearer-plate c is attached to, or is formed integral with an inner-face Zi of its separate box or casing or equivalent part of the frame of the machine in which it is incorporated.

According to the embodiment of the invention shown in Figure 2 a table-bearer-plate c is attached to, or is formed integral with the inner-face avof therelief-table a and the inner-tace b of its separate box or casing j or theV inner-face of the bottom or other part of the frame 7c of the machine in which it is incorporated, remote from the relief*- table a, is formed as a plane-surface and forms a separate roller-bearer-plate b2 to accommodate rollers, balls, or the like e, but in all embodiments of the invention a reliefbearer-plate f having a rectilinear or reciprocating movement is employed and said relief-bearer-plate f is provided with two or more transversely disposed and approximately senii-circular-grooves f on or in one or both faces thereof to accommodate the rounded-ends (Z of a plurality of edge-pressure-plates CZ and with means for attachingl links, or the like g. Said relie-bearer-plate 7*', together with the mechanical devices hereinafter described, forms an automatically releasing and retroceding relief-mechanism that' will Voperate at any predetermined pressure imposed on the relief-table a of the rcliet mechanism.

The mechanical devices which operate in conjunction lwith the said relief-bearer-plate f, and which control it, consist of resilient means, such as a spring g (Figures 1 and v2) or g4 (Figure l) so arranged as to Vbe capable of exercising a predetermined pressure on one end of the said relief-bearerplate f, after such resilient means has been adjusted to a desired position by the adjusting-screw It (Figures l and 2) or zf (Figure 4) checked by an indicator-rod or bar p, which screw has scoring on a 'plain portion 7i thereof.

The other end of thefrelie-bearer-plate f is formed with an abutment t0 abut on a 'stop Z slidably-housed in the separate box or casing y' of the relief-mechanism, as shown in Figs. l and 2, or upon a part or column 7c ot the machine adjacent thereto, as shown in Fig. 4, to which separate box or casing j or column 7c or the like there is secured a bridge-piece or plate m in which an adjustable and rotatably-mounted screwed-member a is mounted to engage with and impart longitudinal movement to the stop Z.

Attached to said stop Z is a scored-rod 0 which travels axially therewith. Said rod o passes through the rotatably-mounted screwed-member n whose free end is bevelled so as tov permit of easy reading otany ot' the scored-marks on the said rod 0 when the stop Z is axially moved by a hand-wheel a mounted on the said screwed-member n.

The object of the slidably-housed stop Z v is to regulate or determine, through the medium of the relief-bearer-plate f and the scored and screwed-rod o, the angularity at which it is desired that the edge-pressureplates Z may be heldat by said stop Z in relation to the plane of the relief-table act the relief-mechanism, and i-t is .this angularity which determines Vthe pressure at which the said edge-pressure-plates Z will be caused to move in a direction to` permit' the relief-table a to retrocede.

rlhe operation of the relief-mechanism is as tollowsz-when pressure is applied to the relief-table a, it is imparted through the medium ot the edge-pressure-plates (Z, the bearer plates c, c and (Figuresl and gli) or the bearer plates c and f and anti-'friction devices@ (Figure 2), to the base d or innerface Zi of the separate box or .casing (or the equivalent therefor if such is .constructed to be a part of theframe of al machine in which the relief-mechanism the subject or' this invent-ion is employed). When the edge-pressure-plates Z are at right angles to the plane of the relief-table a, 'any Vpressure capableV of being delivered to the relief-table a by the machine would not be suiiicient to cause the edge-pressure-plates Z to make angular movement, for the reason 'thatthere would be no component `force when said edge-pressure-plates CZ vare atlright angles to the plane of therelie-table a. Therefore, in order'that therelie-table t may'A operate, the said edge-pressure-plates (Z must iso until -this 'f predetermined: 'resistance isv Vover- C0m6-. Y

Any pressure existing ron or delivered/by .therelief-'table a is `resolved into a' component-force, through the medium of vthe mechanical devices hereinbeffore mentioned,v

which component-force yis easily resisted'by the -yielding-device because a small resilient energy exerted against one end of the reliefbearer-plate j will enable said bearer-plate to resist a great resilient energy existing on advantage where a great load or very high pressures exist on, or are delivered to the relief-table a and where it is desirable that a small resistanceor pressure be exercised' i the said table is slidably mounted, a bearerk by the resilient means.y

When a fluid-container, such as shown in Figure 3, is employed for controlling the movementvof the relief-bearer-plate f a ram or piston s, preferably provided with a roller s (Figure 8) is provided which roller contacts with the pressure-receiving end f2 of the relief-bearer-plate f. Pressure is olotained in the Huid-container by a ram t ofy smaller area` which is controlled and impelled towards or in to the fluid container by means Vof the. spring t coupled to a screwedthreaded member h2 extending through a lever t3 and having a nut h on its free end. vThe lever t3 is fulcrumed in such a manner on the frame or body w of the fluid-container as to allow said Ylever .t3 to contact .with the outer end of a small ram t and so allow said ram to move longitudinally in either direction and lalso to displace the l fluid in the fluid-container and so exert pressure against a larger ram s on which a roller s is mounted and cause said larger ram s' to move through the medium of the fluid in the fluid-container. It is to be understood that the rain-members are of the known kind and therefore no further description is necessary.

The relief-table a of thev relief-mechanism may, as shown in Figure 8, be providedwith T-slots r or the like to enable the securing or attachingthereto of any blanking, raising, or forming-dies,punches, shear-blades, croppcrs, forging, swaging, embossing' or other forms of tools or appliances which vcan be or are ordinarily employed on the ram or bolster of any form of pressure exerting machine.v

fclaimzf- Y f 1; apparatus of the y.class described,

comprising a press table, a frame kin 'which 'theA said tab-le is sl-'idably mounted, a Amovable bearer-plate, edge pressure plates ar-f ranged between the said tableand bearervplate, a resilient member acting on the bearer-plate to vmove the same inl one diivrection, and an abutment adjustably mounted on the frame to limit the movement ofv the bearer plate undervthe action of the said resilient member.

2. An apparatus of the class described, comprising a press table, a frame in which the said tabl-eis slidably mounted, a movable bearer plate, a plurality of parallel edge pressure plates arranged between the said table and bearer plate and spaced apart in the direction in which the said bearer plate is movable, a resilient member acting on the bearer plate to move the same in one direction, and an abutment adjustably mounted on the frame to limit theV movement of the bearer plate under the action of the saidv resilient member.V

3. An apparatus of the class described, comprising a press table, a framein which position 'of the said. abutment independently f of the tension adjusting means.

4. An apparatus ofthe class described, comprisinga press table, a frame in which the said table is -slidably mounted, a bearer plate movably supported in the frame, edge pressure plates arranged betweeiithe said table and bearer plate, a resilient member acting on the bearer plate to move the same v`in' onel direction, and an abutment adjustably held in a fixed position with reference to the frame to limit the movement of the bearer plate.

5. An: apparatusof the class described, comprising apress table,'a frame in which the said table is slidably mounted, a bearer plate movably supported in the frame, edge pressureI plates arranged between the said table and bearer plate, a resilient member acting on the bearer plate to move the same in( kone direction, means forV adjusting the tension of` the said member', an indicator associated with said adjusting means; an labutment adjustably held in a fixed posit-ion with reference to the framey to limit the movement of the bearer plate and a position indicator associated with the said abutment.

6. An apparatus of the `class described, comprising a press-table, a frame in which Vtliesaid table is slidably mounted, a movable bearer plate, edge pressure plates arranged between the said table and bearer plate, a resilient member acting on the bearer plate to move the same in one direction, means for adjusting the tension of said re- V silientf member, an abutment for ysaid tension adjusting means carried rigidly on the frame, and an abutment adjustably mounted on the frame to limit the movement of the bearer plate under the action of the said resilient member.

FRANK r'iUixiPnRIs.l 

